http://stackoverflow.com/questions/10497392/mschart-pie-chart-label-overlapping-issue
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Chart1.Series[0]["PieLabelStyle"] = "Outside";
Chart1.ChartAreas[0].Area3DStyle.Enable3D = true;
Chart1.ChartAreas[0].Area3DStyle.Inclination = 10;
origin - http://www.pipiscrew.com/?p=5930 mschart-pie-chart-label-overlapping